Incandescent lamp.



5&22

' A. s. KNIGHT. V IN GANDESGENT LAMP. APPLICATION FILED JULY 18, 1909.

Patented Feb. 28, 1911' INVENTOR UNI-TED To all whom it may cmiii ew;

35 lamps.

"hcat ,developcd Y which very long ARTHUR S. KNIGHT,

scrapes-japan 'oF Ic F NEWARK, NEW JERSEY. ASSIGNOR T0 WESTINGHOIIlSE LAM]? COMPANY, A CORPORATION OF IENNSYLVANIA.

INCANDESCENT LAMP, 1

Specification of Letters- Patent. Patented Feb, 28, 1911 Appli'cation filed Jul s, 1909. Serial to. 508,543.

lie it known that I, An'rHi m S. Knicn r, a subject of the King a residentof Newark,in the county of E 5 sexand State of New Jersey, have invented anon-mam} useful Improvement in Incandescent Lamps, of which the following is a My i invention relates to 'incandescent lainps, and particularly to supporting means for the :filaments thereof.

The object of the invention is .to provide simple and effective means for so supporting lamp filaments that they may withstand severe shocks and vibrations without breakage, and may eypand and contract freely without subjection t o undue strains. reason of thecrystalline and brittle character ofmetallic tungsten, filaments that are-manufactured therefrom for use in incandescent lamps are extremely fragile,

',and it is accordingly necessary tovery care 'fully mount them in lamps in oi-tlertlitit they may Withstand shocks and vibrations and changes in length resulting fromTheat-ing, cooling and aging without subjection to undue strains and breakage.

It has heretofore been proposed to provide lamps with U-shaped: or reversely bent iilanu-nts the ends of which are connected and securedto terminal leads, and to sup-- port the filaments at the bi'ghls thereof by means of resilient members or anchors that are mounted in'the stems or arbors of the. Such a construction, however, is.

practical for fi aments are emnot satisfactory or entirel lamps in which very long ployed for the. purpose of obtaining high candle power, because the high. degree of draws the temper of the re-' silient supporting members or anchors, and

also for the reason that anchors of reason- 'able size are not suliiciently still to prevent undue vibrations of the filaments. The pres- =-ent supporting device for the filament overcomes the above stated objections, and 15 especially adapted for use in lamps j in filaments are employed.

The invention is illustrated in the accom= of Great Britain, and

panying drawing, the single figure of which is a sideview of a. lamp constructed in accordance therewith.

Projecting in the-usual manner into the bulb 1 of the lamp is a stem 2 through which extend terminal wires or leads 3 and 4, the inner-ends of which are attached and electrically connected to the ends of areversely stem 2,be'tween the leads 3 and 4, a. slipbent or U-shaped filament 5. Mounted in the flattened end portion of the porting member or anchor 6 for the fila ment, that extends substantially-from end- 1 to end of the bulb alongside ofthe filament and the end ofwhich projects into the-tip of the lamp for the purpose of limiting its vibrations and lateral-movements. Sear its free end, the anchor is bent toward the axis of the bulb and is provided with a loop 7 r 'in which one end of a helical spring 8 1s hooked, the other end ,of the spring being hooked in a-link, preferably composed of tungsten, that is, in turn, attached to the filament lhe spring 8 is normally urider tension, thus maintaining the filament taut and permitting of its expansion-and contraction, and it is preferably co nposedof platinum, iridium, or other material the temper of which -is not aiiected by the term perature to which itis subjected duringl'he operation of the lamp. When thus sup ported, the. liability of breakage ot the filament is reduced to a minimum, since \1- brations of the filament are'bdth limitedand cushioned, and expansion and contraction thereof areir'e ely permitted.

I claim .as my invention:

1. An incandescent lamp comprising a bulb having ends, terminals projecting from the stem into the bulb, afirieversely bent filament-com nected at its ends to lhe tleiiminals', an anchor or supporting member carried by the stem and extending into-the tip of the lamp; and resilient means interposed between-the end of'the anchor and the bight of the filament.

.2. An incandescent bulb having a tip and a UT and a. stem atits opposite lani'p comprising a a stem at its opposite into the bulb, ameversely bent filament coni nectecl at its end to the terminals, an anchor or supporting member carried by the stem and extending into the tip of the lamp, and a helical s rin'g intenposed between the end of the anc 101' and the bightof the filament. r

In testimony ivhei'eof, I have hereunto subscribed :my" name this 7th day of July,

GEORGE B ADIL'E,

R. O.:KAR0HNER, 

